The 10-year US Treasury yield rose to its highest level in more than two decades on September 30 after new data showed that the US economy grew faster than expected in the second quarter. The yield, which is closely monitored because it affects borrowing costs throughout the economy, climbed to 5.304% during afternoon trading. It surpassed the previous intraday peak of 5.303% set in 2007, marking its highest level since May 2002, according to WSJ.